From my experience, the primer crimp removal drills that shave the pocket work only so so. They remove the material right at the corner, but sometimes the crimp goes deeper than that. Plus, it opens up the pocket by removing lots of material and wears out the primer pocket much faster. And I will often still have primers hang up or go in crooked with these.
The Dillon swagger works 100%, and does a much better job of getting the crimp fully removed without removing "meat" from the pocket area. It will last for more reloads this way. I have used both tools many times, and the swagger method is a much more reliable crimp removal with less problems afterwards.